| 31. | Through a door, up two short flights of stairs, Lebedev stopped.
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| 32. | One of two original flights of stairs to the building remain.
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| 33. | On another occasion, he threw her birthday cake down a flight of stairs.
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| 34. | Non-working escalators forced some people to climb several flights of stairs.
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| 35. | At the end, the climb out requires several flights of stairs.
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| 36. | He had to walk down more than 100 flights of stairs.
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| 37. | First, we ran from a plaza up a flight of stairs.
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| 38. | Our teams would go up 10, 20 flights of stairs in pitch dark.
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| 39. | He doesn't get winded after walking up a flight of stairs.
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| 40. | Fellow students would carry him in a chair up three flights of stairs.
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